Walmart offers the Flowtron Half-Acre Electric Insect Killer for $16.96. Opt for in-store pickup to avoid the $5.99 shipping charge. That's $7 under our May mention, an all-time best, and the lowest price we could find by $11. It features a non-clogging killing grid, weatherproof construction, and high intensity bulb.It also has the Flowtron 1.5-Ace Electric Insect Killer for $24. Opt for in-store pickup to avoid the $5.99 shipping charge. That's the lowest price we could find by $13.